<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>css实现拖动布局</title>
  <style>
    .column {
      overflow: hidden;
    }

    .column-left {
      height: 400px;
      background-color: #fff;
      position: relative;
      float: left;
    }

    .column-right {
      height: 400px;
      padding: 16px;
      background-color: #eee;
      box-sizing: border-box;
      overflow: hidden;
    }

    .resize-save {
      position: absolute;
      top: 0;
      right: 5px;
      bottom: 0;
      left: 0;
      padding: 16px;
      overflow-x: hidden;
    }

    .resize-bar {
      width: 200px;
      height: inherit;
      resize: horizontal;
      cursor: ew-resize;
      cursor: col-resize;
      opacity: 0;
      overflow: scroll;
    }

    /* 拖拽线 */
    .resize-line {
      position: absolute;
      right: 0;
      top: 0;
      bottom: 0;
      border-right: 2px solid #eee;
      border-left: 1px solid #bbb;
      pointer-events: none;
    }

    .resize-bar:hover~.resize-line,
    .resize-bar:active~.resize-line {
      border-left: 1px dashed skyblue;
    }

    .resize-bar::-webkit-scrollbar {
      width: 200px;
      height: inherit;
    }
  </style>
</head>

<body>
  <div class="column">
    <div class="column-left">
      <div class="resize-bar"></div>
      <div class="resize-line"></div>
      <div class="resize-save">
        左侧的内容，左侧的内容，左侧的内容，左侧的内容
      </div>
    </div>
    <div class="column-right">
      右侧的内容，右侧的内容，右侧的内容，右侧的内容
    </div>
  </div>
</body>

</html>